Signature of deep mantle melting in South Iceland olivine
We present new high-precision major and trace element data on olivine macrocrysts from various volcano-tectonic settings in Iceland and use these data as a proxy for mantle mode and melting conditions. Within individual sampling sites examined (seven lavas and one tephra) olivine-dominated fractiona...
Published in: | Contributions to Mineralogy and Petrology |
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/302548 2024-01-07T09:43:46+01:00 Signature of deep mantle melting in South Iceland olivine Nikkola, Paavo Gudfinnsson, Gudmundur H. Bali, Eniko Ramo, O. Tapani Fusswinkel, Tobias Thordarson, Thorvaldur Department of Geosciences and Geography 2019-06-05T12:26:01Z 19 application/pdf http://hdl.handle.net/10138/302548 eng eng Springer 10.1007/s00410-019-1580-8 Open access funding provided by University of Helsinki including Helsinki University Central Hospital. We thank Matthew Pankhurst and Saemundur Ari Halldorsson for providing the Eyjafjallajokull 2010 and Berserkjahraun samples, respectively. Maren Kahl is thanked for discussions and Atli Hjartarson for skillfully preparing the samples for microprobe and LA-ICP-MS analyses. Comments from two anonymous reviewers improved the manuscript. This work was funded by the Nordic Volcanological Center, Icelandic Research Fund doctoral student Grant (185267-051) and Landsvirkjun geothermal research grant. Nikkola , P , Gudfinnsson , G H , Bali , E , Ramo , O T , Fusswinkel , T & Thordarson , T 2019 , ' Signature of deep mantle melting in South Iceland olivine ' , Contributions to Mineralogy and Petrology , vol. 174 , no. 5 , 43 . https://doi.org/10.1007/s00410-019-1580-8 ORCID: /0000-0002-0512-9116/work/62458687 bce409f9-1cfc-4588-abac-f4ae1f7a7066 http://hdl.handle.net/10138/302548 000467797000003 cc_by openAccess info:eu-repo/semantics/openAccess Olivine Trace elements Mantle heterogeneity Mantle melting Iceland HEIMAEY VOLCANIC CENTER TRACE-ELEMENT RECYCLED CRUST OXIDATION-STATE PLUME PERIDOTITE VARIABILITY TEMPERATURE HAWAIIAN BASALTS 1172 Environmental sciences Article publishedVersion 2019 ftunivhelsihelda 2023-12-14T00:06:34Z We present new high-precision major and trace element data on olivine macrocrysts from various volcano-tectonic settings in Iceland and use these data as a proxy for mantle mode and melting conditions. Within individual sampling sites examined (seven lavas and one tephra) olivine-dominated fractional crystallization, magma mixing and diffusive re-equilibration control observed variability in olivine composition. High-pressure fractional crystallization of clinopyroxene may have lowered Ca and increased Fe/Mn in one olivine population and subsolidus diffusion of Ni and Fe-Mg affected the mantle-derived Ni/Fo ratio in some compositionally zoned olivine macrocrysts. Interestingly, magmas erupted at the southern tip of the Eastern Volcanic Zone (SEVZ), South Iceland, have olivines with elevated Ni and low Mn and Ca contents compared to olivines from elsewhere in Iceland, and some of the SEVZ olivines have relatively low Sc and V and high Cr, Ti, Zn, Cu and Li in comparison to depleted Iceland rift tholeiite. In these olivines, the high Ni and low Mn indicate relatively deep melting (P-final>1.4GPa,similar to 45km), Sc, Ti and V are compatible with low-degree melts of lherzolite mantle, and elevated Zn may suggest modal (low-olivine) or geochemical (high Zn) enrichment in the source. The SEVZ olivine macrocrysts probably crystallized from magmas derived from olivine-bearing but relatively deep, enriched and fertile parts of the sub-Icelandic mantle, and indicate swift ascent of magma through the SEVZ lithosphere. Peer reviewed Article in Journal/Newspaper Heimaey Iceland HELDA – University of Helsinki Open Repository Heimaey ENVELOPE(-22.486,-22.486,65.099,65.099) Contributions to Mineralogy and Petrology 174 5 |
institution |
Open Polar |
collection |
HELDA – University of Helsinki Open Repository |
op_collection_id |
ftunivhelsihelda |
language |
English |
topic |
Olivine Trace elements Mantle heterogeneity Mantle melting Iceland HEIMAEY VOLCANIC CENTER TRACE-ELEMENT RECYCLED CRUST OXIDATION-STATE PLUME PERIDOTITE VARIABILITY TEMPERATURE HAWAIIAN BASALTS 1172 Environmental sciences |
spellingShingle |
Olivine Trace elements Mantle heterogeneity Mantle melting Iceland HEIMAEY VOLCANIC CENTER TRACE-ELEMENT RECYCLED CRUST OXIDATION-STATE PLUME PERIDOTITE VARIABILITY TEMPERATURE HAWAIIAN BASALTS 1172 Environmental sciences Nikkola, Paavo Gudfinnsson, Gudmundur H. Bali, Eniko Ramo, O. Tapani Fusswinkel, Tobias Thordarson, Thorvaldur Signature of deep mantle melting in South Iceland olivine |
topic_facet |
Olivine Trace elements Mantle heterogeneity Mantle melting Iceland HEIMAEY VOLCANIC CENTER TRACE-ELEMENT RECYCLED CRUST OXIDATION-STATE PLUME PERIDOTITE VARIABILITY TEMPERATURE HAWAIIAN BASALTS 1172 Environmental sciences |
description |
We present new high-precision major and trace element data on olivine macrocrysts from various volcano-tectonic settings in Iceland and use these data as a proxy for mantle mode and melting conditions. Within individual sampling sites examined (seven lavas and one tephra) olivine-dominated fractional crystallization, magma mixing and diffusive re-equilibration control observed variability in olivine composition. High-pressure fractional crystallization of clinopyroxene may have lowered Ca and increased Fe/Mn in one olivine population and subsolidus diffusion of Ni and Fe-Mg affected the mantle-derived Ni/Fo ratio in some compositionally zoned olivine macrocrysts. Interestingly, magmas erupted at the southern tip of the Eastern Volcanic Zone (SEVZ), South Iceland, have olivines with elevated Ni and low Mn and Ca contents compared to olivines from elsewhere in Iceland, and some of the SEVZ olivines have relatively low Sc and V and high Cr, Ti, Zn, Cu and Li in comparison to depleted Iceland rift tholeiite. In these olivines, the high Ni and low Mn indicate relatively deep melting (P-final>1.4GPa,similar to 45km), Sc, Ti and V are compatible with low-degree melts of lherzolite mantle, and elevated Zn may suggest modal (low-olivine) or geochemical (high Zn) enrichment in the source. The SEVZ olivine macrocrysts probably crystallized from magmas derived from olivine-bearing but relatively deep, enriched and fertile parts of the sub-Icelandic mantle, and indicate swift ascent of magma through the SEVZ lithosphere. Peer reviewed |
author2 |
Department of Geosciences and Geography |
format |
Article in Journal/Newspaper |
author |
Nikkola, Paavo Gudfinnsson, Gudmundur H. Bali, Eniko Ramo, O. Tapani Fusswinkel, Tobias Thordarson, Thorvaldur |
author_facet |
Nikkola, Paavo Gudfinnsson, Gudmundur H. Bali, Eniko Ramo, O. Tapani Fusswinkel, Tobias Thordarson, Thorvaldur |
author_sort |
Nikkola, Paavo |
title |
Signature of deep mantle melting in South Iceland olivine |
title_short |
Signature of deep mantle melting in South Iceland olivine |
title_full |
Signature of deep mantle melting in South Iceland olivine |
title_fullStr |
Signature of deep mantle melting in South Iceland olivine |
title_full_unstemmed |
Signature of deep mantle melting in South Iceland olivine |
title_sort |
signature of deep mantle melting in south iceland olivine |
publisher |
Springer |
publishDate |
2019 |
url |
http://hdl.handle.net/10138/302548 |
long_lat |
ENVELOPE(-22.486,-22.486,65.099,65.099) |
geographic |
Heimaey |
geographic_facet |
Heimaey |
genre |
Heimaey Iceland |
genre_facet |
Heimaey Iceland |
op_relation |
10.1007/s00410-019-1580-8 Open access funding provided by University of Helsinki including Helsinki University Central Hospital. We thank Matthew Pankhurst and Saemundur Ari Halldorsson for providing the Eyjafjallajokull 2010 and Berserkjahraun samples, respectively. Maren Kahl is thanked for discussions and Atli Hjartarson for skillfully preparing the samples for microprobe and LA-ICP-MS analyses. Comments from two anonymous reviewers improved the manuscript. This work was funded by the Nordic Volcanological Center, Icelandic Research Fund doctoral student Grant (185267-051) and Landsvirkjun geothermal research grant. Nikkola , P , Gudfinnsson , G H , Bali , E , Ramo , O T , Fusswinkel , T & Thordarson , T 2019 , ' Signature of deep mantle melting in South Iceland olivine ' , Contributions to Mineralogy and Petrology , vol. 174 , no. 5 , 43 . https://doi.org/10.1007/s00410-019-1580-8 ORCID: /0000-0002-0512-9116/work/62458687 bce409f9-1cfc-4588-abac-f4ae1f7a7066 http://hdl.handle.net/10138/302548 000467797000003 |
op_rights |
cc_by openAccess info:eu-repo/semantics/openAccess |
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Contributions to Mineralogy and Petrology |
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174 |
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5 |
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1787425048814944256 |